Feb 9, 2016

How to Enable AHCI Mode After Installing Windows

After Windows installation, you can't easily enable AHCI mode from IDE mode. You will notice that your computer will not boot. You will get a message saying "Boot device not found" or end up with Blue Screen - BSOD. What you actually need to do is change the Mode into AHCI first before installing Windows. Don't worry, here is how to enable AHCI mode after windows installation.

1. Boot to Windows using IDE mode. (Do not use AHCI mode).
2. Open registry editor (type regedit on search bar and press enter to open it)
3. Expand the list HKEY_LOCAL_MACHINE / SYSTEM / CurrentControlset / Services.
4. Look for msahci, click on it
5. Look at the right panel, right click on start and select modify.
6. In the value Data insert value 0 (zero)
7. Click OK, close registry editor then reboot.
8. Enter Bios Upon power on and now you can enable AHCI mode.

The method above is a common steps I used (in Windows 7), however there is another way to do it and this steps works with Windows 10.